Transfer film and method for producing a transfer film

Patent metadata

Field	Value
Publication number	US-10427446-B2
Application number	US-201515504836-A
Country	US
Kind code	B2
Filing date	Aug 11, 2015
Priority date	Aug 22, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

The invention relates to a transfer film (1), in particular hot-stamping film, the use of a transfer film (1), a film, a security document (2), and a method for producing a transfer film (1). Here, it is provided that the transfer film (1) comprises a transfer layer (20) detachably arranged on a carrier layer (10). The transfer layer (20) further has at least one first color layer (30) and the at least one first color layer (30) comprises at least one binder and at least first pigments, the color appearance of which changes depending on the observation angle.

First claim

The invention claimed is:

1. A transfer film comprising a transfer layer detachably arranged on a carrier layer, wherein the transfer layer has at least one first color layer, and wherein the at least one first color layer comprises at least one binder and at least first pigments, the color appearance of which changes depending on the observation angle, wherein the at least one first color layer is present in at least one first area of the transfer layer and no color layer is present in at least one second area of the transfer layer, wherein the transfer layer has a first compensation layer which covers the at least one first area of the transfer layer and covers the at least one second area of the transfer layer, and
wherein the transfer layer further comprises:
at least one replication varnish layer disposed between the first color layer and the carrier layer;
a primer layer disposed between the first color layer and the at least one replication varnish layer; and
at least one first stabilizing layer disposed between the at least one replication varnish layer and the carrier layer.

2. The transfer film according to claim 1 , wherein the at least one first area represents a first item of information in the form of a pattern, motif or a logo.

3. The transfer film according to claim 1 , wherein the first compensation layer has a layer thickness between 3 μm and 50 μm.

4. The transfer film according to claim 1 , wherein the first compensation layer is transparent and/or colorless.

5. The transfer film according to claim 1 , wherein the first compensation layer is formed as a bonding layer.

6. The transfer film according to claim 1 , wherein the at least one first color layer has a thickness between 3 μm and 30 μm.

7. The transfer film according to claim 1 , wherein the at least one first stabilizing layer mechanically stabilizes the transfer layer.

8. The transfer film according to claim 7 , wherein the at least one first stabilizing layer has a layer thickness between 0.2 μm and 7.5 μm.

9. The transfer film according to claim 7 , wherein the at least one first stabilizing layer is cross-linked chemically and/or by irradiation with UV light and/or irradiation with electron beams.

10. The transfer film according to claim 7 , wherein the at least one first stabilizing layer is a layer cured by electromagnetic radiation.

11. The transfer film according to claim 7 , wherein the at least one first stabilizing layer is transparent or translucent.

12. The transfer film according to claim 1 , wherein the carrier layer has a layer thickness between 12 μm and 50 μm.

13. The transfer film according to claim 1 , wherein the transfer layer comprises a detachment layer which allows the separation of the transfer layer from the carrier layer.

14. The transfer film according to claim 13 , wherein the detachment layer has a layer thickness between 0.2 μm and 4 μm.

15. The transfer film according to claim 1 , wherein the carrier layer comprises a separating layer curable by means of UV light or electron beams, which allows the separation of the transfer layer from the carrier layer.

16. The transfer film according to claim 1 , wherein the at least one first color layer is applied to the primer layer.

17. The transfer film according to claim 16 , wherein the primer layer has a layer thickness between 0.01 μm and 0.5 μm.

18. The transfer film according to claim 1 , wherein a surface structure is molded into the surface of the replication varnish layer.

19. The transfer film according to claim 18 , wherein the surface structure is not molded into the surface of the replication varnish layer in the at least one first area of the transfer layer.

20. The transfer film according to claim 18 , wherein the refractive index of the replication varnish layer differs from the refractive index of the binder by less than 0.2.

21. The transfer film according to claim 18 , wherein the surface structure is selected from the group of diffractive surface structures, Kinegram or holograms, zero-order diffraction structures, blazed gratings, linear or crossed sinusoidal diffraction gratings, linear or crossed single- or multi-step rectangular gratings, asymmetrical saw-tooth relief structures, light-diffracting and/or light-refracting and/or light-focusing micro- or nanostructures, binary or continuous Fresnel lenses, binary or continuous Fresnel freeform surfaces, diffractive or refractive macrostructures, structures or microprism structures, mirror surfaces and mat structures, anisotropic or isotropic mat structures, or combinations of these structures.

22. The transfer film according to claim 18 , wherein the surface structure of the transfer layer represents a second item of information in the form of a pattern, motif or a logo.

23. The transfer film according to claim 1 , wherein the replication varnish layer is thermoplastically deformable and/or is cross-linked by irradiation with UV light.

24. The transfer film according to claim 1 , wherein the replication varnish layer has a layer thickness between 0.2 μm and 4 μm.

25. The transfer film according to claim 1 , wherein the transfer layer has a reflecting layer, wherein the surface coverage of the reflecting layer is less than 30% of the total surface area of the transfer layer.

26. The transfer film according to claim 25 , wherein the reflecting layer represents a third item of information in the form of a pattern, motif or a logo.

27. The transfer film according to claim 1 , wherein the transfer layer contains at least one mark for determining the at least one first area of the transfer layer.

28. The transfer film according to claim 1 , wherein the first pigments have a diameter between 1 μm and 100 μm and a thickness between 0.1 μm and 5 μm.

29. The transfer film according to claim 1 , wherein the at least one first color layer contains second pigments.

30. The transfer film according to claim 29 , wherein the at least one first color layer contains third pigments which, in the case of irradiation with electromagnetic radiation emit light from the wavelength range visible to the human eye.

31. The transfer film according to claim 1 , wherein the proportion of the at least first pigments in the at least one binder of the at least one first color layer is less than 50%.

32. The transfer film according to claim 1 , wherein the at least one first color layer contains soluble dyes in the at least one binder.

33. The transfer film according to claim 1 , wherein the first pigments are formed as flakes and exhibit a substantially similar orientation to each other with respect to the surface normal established by the plane spanned by the transfer layer.

34. The transfer film according to claim 1 , wherein the orientation of the first pigments with respect to the surface normal established by the plane spanned by the transfer layer and a coordinate system spanned by the transfer layer is locally varied.

35. The transfer film according to claim 1 , wherein the first pigments are magnetic and/or have one or more metal layers.

36. The transfer film according to claim 1 , wherein the transfer layer is present in at least one first zone and is not present in at least one second zone, wherein the fir

Assignees

• Ovd Kinegram Ag

Inventors

• Staub Rene
• Streb Christina
• Hoffmann Michael
• Gnos Reto

Classifications

• B42D25/36 Primary

  comprising special materials · CPC title

• B42D25/455

  using heat · CPC title

• B41M3/12 Primary

  Transfer pictures or the like, e.g. decalcomanias {(processes for producing decorative surface effects B44C1/00; B41M5/0256 takes precedence)} · CPC title

• B42D25/46

  using pressure · CPC title

• B42D25/328

  Diffraction gratings; Holograms · CPC title